Smoke is produced due to__________________?
Correct answer: D. All A., B. and C.
- A. Insufficient supply of combustion air and insufficient time for combustion
- B. Poor quality of fuel and improper mixing of fuel & combustion air
- C. Poor design & overloading of furnace
- D. All A., B. and C.
Explanation
Smoke forms when fuel does not burn completely, commonly because of inadequate air, poor mixing, insufficient time, poor fuel quality, or an overloaded and badly designed furnace. Thus all the listed causes can contribute.
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